CN110732669A

CN110732669A - supplementary print lift platform of additive manufacturing

Info

Publication number: CN110732669A
Application number: CN201911036181.2A
Authority: CN
Inventors: 颜铁林; 宰雄飞; 曹玄扬; 周朝辉
Original assignee: Changsha New Material Industry Research Institute Co Ltd
Current assignee: Aerospace Science and Industry Changsha New Materials Research Institute Co Ltd
Priority date: 2019-10-29
Filing date: 2019-10-29
Publication date: 2020-01-31
Anticipated expiration: 2039-10-29
Also published as: CN110732669B

Abstract

The invention discloses a additive manufacturing auxiliary printing lifting platform which comprises a forming platform, wherein the top of the forming platform penetrates through an empty bin, the middle of the forming platform is matched and fixed on a transmission device at the bottom of the empty bin, the other side of the transmission device is matched and connected with a powder storage platform, the top of the empty bin is connected with a top plate and the bottom of the empty bin is connected with a bottom plate, a powder leakage hopper and a scraper are arranged on the top plate, two symmetrical wall supports are further arranged on two sides of the end, close to a top plate , of the empty bin, and the forming platform and the powder storage platform can move up and down relative to the empty bin respectively.

Description

supplementary print lift platform of additive manufacturing

Technical Field

The invention relates to the technical field of additive manufacturing, in particular to additive manufacturing auxiliary printing lifting platforms.

Background

The additive manufacturing technology (also called 3D printing) is a method for directly manufacturing a three-dimensional physical entity in a layer-by-layer accumulation mode based on a computer three-dimensional CAD model, can rapidly and precisely manufacture parts with any complex shapes and structures on pieces of equipment so as to realize free manufacturing, is oriented to the high-end manufacturing fields of aerospace, weapon manufacturing, automobiles, molds, biomedical science and the like, directly manufactures three-dimensional complex structures, and solves the problem that the traditional manufacturing technology is difficult to process and manufacture even cannot process and manufacture.

In view of the superiority of additive manufacturing, various targeted 3D printing technologies such as selective laser melting, direct metal melting deposition, photosensitive resin selective solidification, selective laser sintering, 3D jet printing and the like exist at present, the 3D printing technology used in the current industrial level is mostly metal melting deposition, the printing mode is that firstly metal powder is impacted out of powder from a powder bin through a powder spreading device, then the powder spreading device moves back and forth, the metal powder is scraped and spread evenly to the upper surface of a forming printing working platform, the redundant metal powder is scraped out along with the movement of the powder spreading device and leaks out from a powder leakage position, finally the metal powder is formed through laser sintering above the working platform, after the forming printing working platform is completed, the forming printing working platform descends for a certain depth, powder spreading is carried out again, the metal powder is formed through laser sintering, and powder spreading, sintering, printing and forming are carried out to form a required workpiece layer by layer in a round way, and therefore, the metal melting deposition printing equipment achieves powder spreading through four parts, namely the powder bin, the powder spreading device, the forming working platform and.

Because the current metal fused deposition additive manufacturing mode is in a continuous development stage, and a plurality of printed metal powders are also in a verification stage, the metal fused deposition printing equipment is mostly used for printing and verifying various powders, and most of the printed and molded workpieces are small blocks, stretching rods or small parts, under the influence of equipment cost, at present, the printing equipment of many scientific research institutes only has to two pieces of equipment, but the types of the printable metal powders are various, so that each time verified workpieces are printed, when another metal powder workpieces are printed and verified, the four parts of the metal fused deposition printing equipment need to be integrally disassembled, cleaned and re-assembled, the consumed time is too long, equipment resources are vacant, and a plurality of persons are required to operate in the cleaning process, so that the labor cost is increased, and the integral air tightness is greatly influenced after the equipment is disassembled and assembled for many times.

Disclosure of Invention

The invention aims to solve the technical problem that additive manufacturing auxiliary printing lifting platforms are provided, so that the operation process can be simplified, the cleaning time can be saved, the labor cost can be reduced, and the air tightness of equipment cannot be influenced when small workpieces are printed.

kinds of material increase manufacturing assist prints the lifting platform, including the bottom fixes the shaping platform on the original metal melting deposition printing equipment work platform, the top of the said shaping platform crosses the empty storehouse, the middle part cooperates and connects the drive unit fixed on bottom of the said empty storehouse, the said drive unit locates at the other side of the said shaping platform cooperates and connects and holds the powder platform;

the top of the empty bin is fixedly connected with a top plate, the bottom of the empty bin is fixedly connected with a bottom plate, a detachable powder leakage hopper and a slidable scraper are arranged on the top plate, and an adjustable gap is formed between the scraper and the top plate;

two symmetrical wall supports are further arranged on two sides of the empty bin, which are close to the end of the top plate , and the forming platform and the powder storage platform can respectively move up and down relative to the empty bin under the action of the transmission device.

, the printing platform further comprises a shaft sleeve and a second shaft sleeve fixed on the bottom plate far from the empty bin side, the shaft sleeve is in sliding fit with the powder storage platform, and the second shaft sleeve is in sliding fit with the forming platform.

, the powder standing platform comprises a th optical axis and a th rack which are respectively matched with the shaft sleeve in a sliding way at the middle part, the th optical axis and the th rack are respectively fixedly connected with the upper top surface of the near the end of the top plate, and the th rack is meshed with the transmission device.

, the forming platform comprises a support plate fixedly mounted on the working platform, a second optical axis and a second rack are fixedly mounted on the support plate close to the surface of the empty bin, the middle parts of the second optical axis and the second rack are respectively in sliding fit with the second shaft sleeve, and the second rack is meshed with the transmission device;

the second optical axis and the other ends of the second rack respectively penetrate through the empty bin and then are fixedly connected with a second upper top surface, and the second upper top surface is far away from the surface of the supporting plate and is detachably provided with a small substrate.

, the transmission device comprises gears with two sides respectively engaged with the rack and the second rack, the gears are sleeved on the central shaft, two ends of the central shaft are symmetrically and rotatably connected with bearings, and the two bearings are respectively fixedly installed on two sides of the bottom of the empty bin through installation plates.

And , the top plate and the empty bin, the bottom plate and the empty bin, the wall support and the empty bin and the mounting plate and the empty bin are fixedly connected by fixing screws.

, a threaded hole matched with the support plate is formed in the working platform, and the working platform and the support plate are fixedly connected through a fixing screw.

, the hopper is detachably mounted on the top plate by screws or buckles.

, the optical axis, the second optical axis, the rack and the second rack are parallel to each other pairwise, the top plate, the bottom plate and the support plate are parallel to each other pairwise, and the optical axis is perpendicular to the top plate.

The invention also provides metal fused deposition printing devices comprising additive manufacturing auxiliary printing lifting platforms as described above.

Compared with the prior art, the invention has the advantages that:

, the invention designs and manufactures sets of auxiliary printing lifting platforms for additive manufacturing aiming at the current metal fused deposition printing equipment, the lifting platform can be integrally arranged in the metal fused deposition printing equipment and can be independently disassembled, the original powder cabin is replaced by the powder standing platform, the original powder spreading device is replaced by the scraper, the original working platform is replaced by the forming platform, and the original powder leakage position is replaced by the powder leakage hopper, when kinds of metal powder are printed and then another kinds of metal powder are printed, the whole metal fused deposition printing equipment does not need to be disassembled, cleaned and reassembled, the invention only needs to be independently taken out from the metal fused deposition printing equipment for cleaning, the operation process is greatly simplified, the working time and the labor cost are saved, and the idle time of the equipment is shortened.

The metal powder used for printing can be printed without being added into a powder bin behind the equipment in advance, and is isolated from pollution of the metal powder used for the previous printing, so that the printing effect is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

The invention is further described with reference to the following figures:

fig. 1 is an exploded view of additive manufacturing assisted print lift platforms of the present invention;

FIG. 2 is a schematic view of the assembly of the empty bin with the top plate;

FIG. 3 is a schematic view of the assembly of the empty bin with the floor;

FIG. 4 is a schematic view of the assembly of the empty bin with the wall braces;

FIG. 5 is a schematic view of the assembly of the empty bin with the transmission;

FIG. 6 is an assembly view of the empty bin and the powder holding platform;

FIG. 7 is a schematic view of the assembly of the empty bin with the forming platform;

FIG. 8 is a schematic view of the assembly of the empty bin and the hopper;

FIG. 9 is an assembled schematic view of the present invention mounted on a metal fused deposition printing apparatus;

FIG. 10 is an overall dimensional view of the present invention;

fig. 11 is a perspective view of a conventional metal fused deposition printing apparatus;

1. the powder filling machine comprises a scraper, a powder leakage hopper, a top plate, a wall support, a hollow bin, a forming platform, a powder storage platform, a powder spreading device, a working platform, a powder leakage position 40, a powder leakage position 61, a second optical axis 62, a second rack, a supporting plate 63, a supporting plate 64, a second upper top surface 71, an optical axis 72, a rack 73, an upper top surface , a shaft sleeve 81, a , a second shaft sleeve 82, a gear 91, a gear 92 and a bearing 5.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only partial embodiments of the present invention, rather than all embodiments.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. at a certain posture (as shown in the figure), and if the certain posture is changed, the directional indicator is changed accordingly.

Thus, a feature defined as "", "second" may explicitly or implicitly include at least of that feature.

Unless otherwise expressly stated or limited, the terms "couple," "couple," and the like are used herein to mean , and for example, "couple" may be a fixed connection, a removable connection, or a entity, a mechanical connection, an electrical connection, a physical connection, a wireless communication connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Example

The additive manufacturing auxiliary printing lifting platforms shown in the attached drawings 1-11 comprise a forming platform 6 with the bottom fixed on a working platform 30 of an original metal melting deposition printing device, wherein the working platform 30 is provided with a threaded hole 11, the forming platform 6 is fixedly connected with the working platform 30 through a fixing screw 13 matched with the threaded hole 11, the top of the forming platform 6 penetrates through a vacant bin 5, the middle of the forming platform 6 is matched and connected with a transmission device 9 fixed at the bottom of the vacant bin 5, the transmission device 9 is positioned on the other side of the forming platform 6 and is matched and connected with a powder holding platform 7, the forming platform 6 and the powder holding platform 7 can respectively move up and down relative to the vacant bin 5 under the action of the transmission device 9, specifically, the forming platform 6 moves down layer by layer, and the powder holding platform 7 simultaneously moves up by the same distance layer by layer.

Preferably, the empty bin 5 is provided with two mutually independent cavities, the forming platform 6 penetrates through cavities, the powder standing platform 7 penetrates through another cavities, the top of the empty bin 5 is fixedly connected with the top plate 3 through a fixing screw 13, the bottom of the empty bin 5 is fixedly connected with the bottom plate 8 through a fixing screw 13, the top plate 3 is provided with a detachable powder leaking hopper 2 and a slidable scraper 1 which are detachably connected through screws or buckles, the powder leaking hopper 2 is located at the tail end of the stroke of the scraper 1 and used for bearing redundant metal powder scraped by the scraper 1, the scraper 1 serves as a powder spreading device 20 in the original metal fused deposition printing equipment, the powder leaking hopper 2 serves as a powder leaking position 40 in the original metal fused deposition printing equipment, and an adjustable gap is formed between the scraper 1 and the top plate 3, so that gap adjustment can be performed according to the size of the powder, and different types of printing requirements can be realized.

Preferably, two symmetrical wall braces 4 are further arranged on two sides of the empty bin 5 near the end of the top plate 3 , and particularly, the two wall braces are fixedly connected with the empty bin 5 through fixing screws 13, after the additive manufacturing auxiliary printing lifting platform is integrally sunk into the metal fused deposition printing equipment, the four fixing screws 13 on the top plate 3 are screwed, so that the wall braces 4 work, and the positions of the top plate 3 and the empty bin 5 are fixed, so that preparation is made for the next steps of printing work.

Preferably, the auxiliary printing and lifting platform for additive manufacturing further comprises a shaft sleeve 81 and a second shaft sleeve 82 which are fixed on the bottom plate 8 and far away from the empty bin 5 side, the shaft sleeve 81 is in sliding fit with the powder storage platform 7, and the second shaft sleeve 82 is in sliding fit with the forming platform 6, so that the forming platform 6 and the powder storage platform 7 can be lifted and lowered smoothly.

As shown in fig. 6, the powder standing platform 7 serves as a powder bin 10 in the original metal fused deposition printing apparatus, and includes a optical axis 71 and a rack 72 whose middle portions are respectively in sliding fit with the shaft sleeve 81, ends of the optical axis 71 and the rack 72 close to the end of the top plate 3 are respectively fixedly connected with an upper top surface 73, the upper top surface 73 is used for enabling metal powder to overflow the upper surface of the top plate 3 layer by layer, and the rack 72 is engaged with the transmission device 9.

As shown in fig. 7, the forming platform 6 serves as a working platform 30 of an original metal fused deposition printing apparatus, and includes a supporting plate 63 fixedly mounted on the working platform 30, a second optical axis 61 and a second rack 62 are fixedly mounted on the supporting plate 63 near the surface of the empty bin 5, the middle portions of the second optical axis 61 and the second rack 62 are respectively in sliding fit with the second bushing 82, and the second rack 62 is engaged with the transmission device 9;

the second optical axis 61 and the other ends of the second rack 62 respectively penetrate through the empty bin 5 and then are fixedly connected with a second upper top surface 64, the second upper top surface 64 is far away from the surface of the supporting plate 63, a small base plate 14 is detachably mounted on the second upper top surface, the small base plate 14 is used for realizing the tiling and laser sintering molding of metal powder, and the powder is repeatedly spread layer by layer and laser sintering is carried out, so that a required machined part is formed.

As shown in fig. 5-7, the transmission device 9 includes a gear 91 having two sides respectively engaged with the th rack 72 and the second rack 62, the gear 91 is sleeved on a central shaft, two ends of the central shaft are symmetrically and rotatably connected with bearings 92, the two bearings 92 are respectively fixedly mounted on two sides of the bottom of the empty bin 5 through mounting plates, and the mounting plates tightly clamp the bottom plate 8.

Preferably, the optical axis 71, the second optical axis 61, the rack 72 and the second rack 62 are parallel to each other pairwise, the top plate 3, the bottom plate 8 and the support plate 63 are parallel to each other pairwise, the optical axis 71 is perpendicular to the top plate 3, the rack 72 is ensured to lift in the direction perpendicular to the top plate 3 under the guiding action of the optical axis 71, and the second rack 62 is ensured to lift in the direction perpendicular to the support plate 63 under the guiding action of the second optical axis 61, so that the lifting verticality is ensured, and the printing precision is effectively improved.

Preferably, roof 3 is kept away from the face of empty storehouse 5 is provided with a plurality of bar archs, seted up a plurality ofly on the scraper 1 and corresponded the bellied recess of bar, when scraper 1 scraped metal powder, the protruding effect of leading is played with the recess cooperation of bar, improves the effect of scraping the powder.

The invention designs and manufactures sets of additive manufacturing auxiliary printing lifting platforms aiming at the current metal fused deposition printing equipment, the lifting platforms can be integrally arranged in the metal fused deposition printing equipment and can be integrally and independently disassembled, the powder storage platform 7 replaces the original powder bin 10, the scraper 1 replaces the original powder spreading device 20, the forming platform 6 replaces the original working platform 30, and the powder leakage hopper 2 replaces the original powder leakage position 40, when kinds of metal powder are printed and another kinds of metal powder are printed, the metal fused deposition printing equipment is not required to be integrally disassembled, cleaned and reassembled, the metal fused deposition printing equipment is only required to be independently taken out from the equipment for cleaning, the operation process is greatly simplified, the working time and the labor cost are saved, the idle time of the equipment is shortened, the printing can be carried out under the condition that the equipment is not required to be integrally disassembled and the air tightness of the equipment is well protected, the metal powder used for printing is not required to be added into the powder bin behind the equipment in advance, and is isolated from the metal powder used for printing in the previous time, thereby improving the printing effect.

The specific use process of the additive manufacturing auxiliary printing lifting platform comprises the following steps: the invention is fixedly installed on the metal melting deposition printing equipment by the fixing screw 13 passing through the supporting plate 63 and being in threaded connection with the threaded hole 11, the position of the thickness parameter of the substrate is set on the operation interface of the metal melting deposition printing equipment, the parameter of the height h of the invention is input, the overall length dimension a and the width dimension b (shown in figure 10) of the invention are both smaller than the length dimension L1 and the width dimension L2 (shown in figure 11) of the working platform 30, and the working platform 30 is lowered to the depth which is the same as the height h (shown in figure 10) of the invention; thus, the whole of the invention sinks into the metal fused deposition printing equipment, the upper surface of the top plate 3 of the invention is flush with the table top 12 (shown in figure 11) of the equipment; the four fixing screws 13 connected with the wall brace 4 on the top plate 3 of the invention are screwed down, so that the wall brace 4 works, thereby fixing the position of the invention in the equipment.

The small substrate 14 with a measured thickness value is installed on the forming platform 6, the equipment operation interface of the height h parameter of the forming platform is input before, the thickness value of the small substrate 14 is input, and the platform can adopt a substrate smaller than the original substrate aiming at the characteristic that the printed small workpiece occupies a small printing area; clicking a sinking key of the original working platform of the equipment to enable the upper surface of the small substrate 14 to be flush with the upper surface of the top plate 3; the powder storing platform 7 is filled with metal powder to be printed and verified at this time, and the scraper 1 is installed in place; inputting the printing process into equipment, and starting to print and form the workpiece.

In the printing process, the platform works through the up-and-down transmission power of the existing equipment, the forming platform 6 descends layer by layer, the second rack 62 drives the gear 91 to rotate through meshing, the gear 91 rotates to drive the th rack 72 to move upwards layer by layer, the powder storage platform 7 moves upwards layer by layer under the transmission action of the th rack 72, metal powder overflows the upper surface of the top plate 3 layer by layer, the scraper 1 moves under the original drive of the equipment, powder overflowing from the powder storage platform 7 is scraped and evenly spread to the upper surface of the small substrate 14, redundant metal powder is scraped out through the movement of the scraper 3 and leaks into the powder leakage hopper 2 to be collected, finally the metal powder spread above the small substrate 14 is formed through laser sintering, after the process is completed, the forming platform 6 descends again to -layer depth, the scraper carries out secondary powder scraping, the metal powder on the upper surface of the small substrate 14 is sintered through laser, and the small workpieces required by layer laser sintering forming are repeatedly laid layer by layer.

After the workpiece is printed and formed, in an equipment operation interface, originally controlling the lifting parameter key position of the working platform 30, inputting the forming height parameter of the printed workpiece, and lifting the original working platform 30 of the equipment until the formed workpiece on the forming platform 6 is completely exposed above the top plate 3 of the invention; excess metal powder exposed on the workpiece is cleaned into the powder leakage hopper 2, and four fixing screws 13 connected with the wall support 4 on the top plate are loosened to enable the wall support 4 to be separated from the equipment. Clicking an 'absolute height' key of an original working platform 30 of the equipment on an equipment operation interface to enable the whole machine to rise above an equipment table-board 12; and (3) loosening four screws for connecting and fixing the bottom plate 8 of the invention and the original working platform 30 of the equipment, taking the invention out of the forming bin of the metal melting deposition printing equipment integrally, and finishing the printing.

Example two

The invention further provides metal fused deposition printing equipment based on the , which comprises the additive manufacturing auxiliary printing lifting platform as described in the , and the using process is similar to that of the embodiment .

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1, kinds of material increase manufacturing auxiliary printing lifting platform, including the bottom fixes the shaping platform (6) on the original metal melting deposition printing equipment work platform (30), wherein the top of the said shaping platform (6) crosses the empty storehouse (5), the middle part cooperates and connects the drive unit (9) fixed in the bottom of the said empty storehouse (5), the said drive unit (9) locates at another side of the said shaping platform (6) cooperates and connects and holds the powder platform (7);

the top of the empty bin (5) is fixedly connected with a top plate (3) and the bottom of the empty bin is fixedly connected with a bottom plate (8), the top plate (3) is provided with a detachable powder leakage hopper (2) and a slidable scraper (1), and an adjustable gap is formed between the scraper (1) and the top plate (3);

the two sides of the empty bin (5) close to the end of the top plate (3) are further provided with two symmetrical wall supports (4), and the forming platform (6) and the powder storage platform (7) can respectively move up and down relative to the empty bin (5) under the action of the transmission device (9).

2. The auxiliary printing lift platform of additive manufacturing according to claim 1, further comprising a shaft sleeve (81) and a second shaft sleeve (82) fixed on the bottom plate (8) far from the empty bin (5) side, wherein the shaft sleeve (81) is in sliding fit with the powder storage platform (7), and the second shaft sleeve (82) is in sliding fit with the forming platform (6).

3. The auxiliary printing and lifting platform for additive manufacturing according to claim 2, wherein the powder storage platform (7) comprises a optical axis (71) and a rack (72) with the middle portions slidably engaged with the shaft sleeves (81), ends of the optical axis (71) and the rack (72) near the end of the top plate (3) are fixedly connected with an upper top surface (73) of the , and the rack (72) is engaged with the transmission device (9).

4. The additive manufacturing auxiliary printing lifting platform of claim 2, wherein the forming platform (6) comprises a support plate (63) fixedly mounted on the working platform (30), a second optical axis (61) and a second rack (62) are fixedly mounted on the support plate (63) near the surface of the empty bin (5), the middle parts of the second optical axis (61) and the second rack (62) are respectively in sliding fit with the second shaft sleeve (82), and the second rack (62) is meshed with the transmission device (9);

the second optical axis (61) and the other ends of the second rack (62) respectively penetrate through the empty bin (5) and then are fixedly connected with a second upper top surface (64), and the surface, far away from the supporting plate (63), of the second upper top surface (64) is detachably provided with a small substrate (14).

5. The auxiliary printing and lifting platform for additive manufacturing of any claims 1-4, wherein the transmission device (9) comprises a gear (91) with two sides respectively engaged with the rack (72) and the second rack (62), the gear (91) is sleeved on a central shaft, two ends of the central shaft are symmetrically and rotatably connected with bearings (92), and the two bearings (92) are respectively and fixedly mounted on two sides of the bottom of the empty bin (5) through mounting plates.

6. The kinds of additive manufacturing auxiliary printing lift platform of claim 5, wherein the top plate (3) and the empty bin (5), the bottom plate (8) and the empty bin (5), the wall brace (4) and the empty bin (5), and the mounting plate and the empty bin (5) are all connected and fixed by fixing screws (13).

7. The additive manufacturing auxiliary printing lifting platform of claim 6, wherein the working platform (30) is provided with a threaded hole (11) matched with the support plate (63), and the working platform (30) and the support plate (63) are fixedly connected by a fixing screw (13).

8. additive manufacturing auxiliary printing lifting platform according to claim 1, wherein the powder hopper (2) is detachably mounted on the top plate (3) by screws or buckles.

9. The additive manufacturing printing assisting elevation platform of claim 5, wherein the optical axis (71), the second optical axis (61), the rack (72), and the second rack (62) are parallel to each other two by two, the top plate (3), the bottom plate (8), and the support plate (63) are parallel to each other two by two, and the optical axis (71) is perpendicular to the top plate (3).

10, metal fused deposition printing apparatus, comprising additive manufacturing auxiliary printing lift platform as claimed in any of claims 1-9 to .